Synonyms of 'unofficial'
Unofficial estimates speak of at least two hundred dead.
Copyright © 2016 by HarperCollins Publishers. All rights reserved.
If you are casual, you are, or you pretend to be, relaxed and not very concerned about what is happening or what you are doing.
an easy-going young man with a casual approach to life
Informal speech or behaviour is relaxed and friendly rather than serious, very correct, or official.
She is refreshingly informal.
Thesaurus for unofficial from the Collins English Thesaurus
An unofficial action or statement is not organized or approved by a person or group in authority.